GPT-5.4 Pro is OpenAI’s highest-capability model in ChatGPT, available on Pro, Business, Enterprise, and Edu tiers. It uses extended compute to deliver OpenAI’s deepest reasoning, longest sustained tasks, and most reliable outputs on hard problems.
Pro is the model to reach for when correctness matters more than speed — long research tasks, complex code reviews, intricate analysis, and high-stakes work where you want the strongest answer the platform can produce.